A sample of hydrogen gas at 341 K experiences a change in volume from 5.49 L to 3.12 L. If its new pressure is 3.48 atm at 215 K, what was its original pressure in atmospheres?
Q172251
A sample of hydrogen gas at 341 K experiences a change in volume from 5.49 L to 3.12 L. If its new pressure is 3.48 atm at 215 K, what was its original pressure in atmospheres?'
Solution:
Initial temperature of hydrogen gas is 341K.
Volume of sample of hydrogen gas changed from 5.49 L to 3.12L, so
V initial = 5.49 L and V final = 3.12 L.
New pressure is 3.48 atm at 215K, which means
P final = 3.48 atm and T final = 215 K.
We have to find the original pressure ( initial ) in 'atm',
P initial = unknown ; P final = 3.48 atm
V initial = 5.49 L ; V final = 3.12 L
T initial = 341 K ; T final = 215 K
We can use the combined gas equation here.
Substitute all the given information in the formula, we have
divide both the side by 0.01610 L/K, we have
In the question all the quantities are given in 3 significant figure, so our final answer must also
be in 3 significant figure.
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